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On the wire to the battery do you have to run the Circuit Breaker and a fuse or just the fuse or both?Thanks
 

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I use a fuseable link 2 sizes smaller than the power feed wire for fail safe operation and protection in case of a direct short. A circuit breaker will work too if the same amperage as the relay, the advantage being it will reset if accidentially tripped or you have an intermitant problem. A relay is for carring a electrical load, and imho a fuse is a weak link as when it's done, it's done. Remember, everything electrical has smoke in it... and it's not done until you let the smoke out...lol
 

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Fuses are good for well behaved loads that draw minimal current and don't have too much of a turn-on current spike. Fusable links are best suited as a safety device to prevent a wiring system melt-down. They're best when the power supply line runs a fair distance where there is a risk of a wire rubbing through and creating a short ahead of the fuse / breaker. There aren't too many cases where a fusable link alone makes a good fuse. An exception would be high current loads, especially motors (like electric fans) that draw huge currents (in excess of 20 amps) and have an even larger turn-on current spike. Something like head lights would probably be best suited by a self resetting circuit breaker. Any high wattage bulb will have a sharp current spike when you turn them on, but not nearly as much as a motor. A self resetting thermal breaker would handle that with no problem. You didn't saw what your load is so hopefully these guidelines will give you same ideas.
 

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A fuse would be a better choice for those IMHO. However you could use a fusable link to the supply side of the relay and a fuse on the load side.
 
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